I’ve got one. Got it on a deal when they first came out.
In honesty, I generally think 24 inch is about the practical limit in 1/2 inch drive, and even then a 24 inch bar will flex (although some manufacturers, such as Stahlwille, make the 24 inch bar heftier).
If I need anything more than a 24 inch bar I generally go for 3/4” drive, and I sometimes find a shorter 3/4” drive bar works better than a long 1/2” as it’s so much more rigid.
But… I do have some uses (hub nuts) where I have to use a 1/2” drive socket, and the torque is considerable. Those are the jobs I got the 36 inch for.
In honesty I doubt I am applying more torque than the 24 inch bar is capable of, but the 36 just makes life easier.
I’ve had no issues with it, and in fact quite like it.